Troubleshooting; Messages From The Dsu/Csu; Table 11-1. Messages From The Dsu/Csu - ADTRAN DSU III ARdc User Manual

TROUBLESHOOTING

This section is intended to provide a quick and easy means of diagnosing
suspected problems associated with local or remotely attached ADTRAN
DSU/CSUs. Two separate troubleshooting sections are provided; one
focuses on new installs, the other on existing circuits.

Messages from the DSU/CSU

The DSU III ARdc displays messages on the LCD display and LEDs con-
cerning the status of the unit and the local loop. If the Alarm LED is on,
one or more of the messages shown in Table 11-1 is displayed on the LCD.
The Status menu must be selected in order for the unit to display status mes-
sages. Pressing Quick returns to the main menu where STATUS can be
selected.
Message
LOOP IS Good local loop sig-
NORMAL nal being received
from the telco.
OPEN LOOP Unit not receiving a
signal from the telco.
NO RX SIGNAL Unit detects sealing
current but no data
signal from telco.
OOS/OOF Unit detects an Out of
FROM NET Service or Out of
Frame condition from
the telco.
61200270L1-1

Table 11-1. Messages from the DSU/CSU

Meaning Probable Cause
Indicates good local
loop.
Bad telco cable from
the DSU to telco jack
or bad circuit to telco.
Bad conductor in telco
cable from DSU to
telco jack or bad cir-
cuit to telco.
Telco is having prob-
lems with DDS circuit
or remote unit is
turned off or discon-
nected.
DSU III ARdc User Manual
Chapter 11. Testing and Troubleshooting
Action
No action required; unit
properly connected to telco
circuit.
Replace telco cable from
DSU to wall jack. If a prob-
lem persists, contact telco
provider.
Replace telco cable from
DSU to wall jack. If a prob-
lem persists, contact telco
provider.
Check remote unit. Contact
telco service provider.
11-5